Don't believe everything that's leaked by prescient French retailers. Though Amazon France has a good record for revealing release dates, French supermarket E.Leclerc seems to have missed the mark with its posting (opens in new tab) for a Witcher 3: Wild Hunt Enhanced Edition dated February 5, as spotted by NeoGAF user Renae (opens in new tab). Further research by Coreda using the listing's EAN barcode uncovered a Belgian site (opens in new tab) with the same entry. According to CD Projekt's Pawel Bruza, however, it's collective madness.
"There's no Enhanced Edition of The Witcher 3: Wild Hunt that we are aware of," Burza said on the CD Projekt forums (opens in new tab), "this is some kind of error that we will look into."
It could be a brazen cover-up of course, but that doesn't make sense to me. For one thing, we're still due Wild Hunt's biggest expansion, Blood and Wine (opens in new tab)—why release a second version before the first is complete? For another, CDPR have been enhancing their hearts out (opens in new tab) in patches which brought the same sort of interface and balance changes boasted by the Enhanced Editions (opens in new tab) of The Witcher 1 and 2.
Burza doesn't deny the possibility of an Enhanced Edition in future, but I'd expect it to take the form of a complete 'game of the year (opens in new tab)'-type deal.